Liquid Crystal Display, Pixel Structure and Driving Method

ABSTRACT

The present invention provides a liquid crystal display device, a pixel structure and a driving method. The first scanning line of the first scanning line transmits a scanning signal of the first switching unit, charging the pixel electrode, after the charge, when the pixel electrode is in the state of holding power, the second scanning line transmits the second scanning signal to turn on the second switching unit, the common electrode line provides the common voltage to the pixel electrode, in order to rise the pixel electrode voltage to the common voltage. Through the above ways, on one hand the present invention can ensure the charging time of the pixel electrode and the resolution of the liquid crystal display device, on the other hand inserting the black image, achieving the inserting black image technique, reducing the 3D cross talk.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to the field of display techniques, and inparticular to a liquid crystal display, a pixel structure and a drivingmethod

2. The Related Arts

The 3D Shutter Glass technology commonly has a problem that cross talkis too large, in order to solve this issue, currently, there are twocommon solutions in the present technique:

The first solution is BLU Scanning Mode, the basic frequency is 120 Hz;the second one is Black Insertion, namely, it is BLU Blinking Mode,which is achieved by inserting a black image during the signals of theright and left eyes switching, for example, after the end of the framein the right eye, inserting a black image, and scanning the frame in theleft eye. However, these two methods have certain limitations currently.

Wherein, the first solution is limited by its scanning method, BLU isrequired being single-short or double-short design, and theeffectiveness of improving cross talk is poor. The second solution needsinserting a black image during the signals of the right and left eyesswitching, so it is requires the higher refresh rate, which is commonly240 Hz, it will reduce the charging time to half of 120 Hz, making thepanel be at the risk of insufficient charge, furthermore, leading theemergence of mura, extremely affecting the quality of liquid crystaldisplay device.

SUMMARY OF THE INVENTION

The technical issue to be solved by the present invention is to providea liquid crystal display device, a pixel structure and a driving method,on one hand which can ensure the charging time and the resolution of theliquid crystal display device, on the other hand which can also achievethe inserting black image technique, furthermore, reducing the 3D crosstalk. In order to solve the technical issue, one technical solutionadopted by the present invention is to provide a pixel structure, thepixel structure comprises a data line, a first scanning line which isorthogonal to the data line, a second scanning line which is in parallelwith the first scanning line, a pixel electrode which is providedbetween the first scanning line and the second scanning line and acommon electrode line which is used for providing common voltage, thepixel structure also comprises the first switching unit which iselectrically connected with the first scanning line and the secondscanning unit which is electrically connected with the second scanningline; wherein, the first scanning line is used to transmit a scanningsignal of the first switching unit, the data line provides a pixelelectrode voltage to the pixel electrode through the first switchingunit which has turned on, charging the pixel electrode. After thecharge, when the pixel electrode is in the state of holding power, thesecond scanning line transmits the second scanning signal to turn on thesecond switching unit, the common electrode line provides the commonvoltage to the pixel electrode through the second switching unit whichhas turned on, in order to rise the pixel electrode voltage to thecommon voltage.

Wherein, the gate of the first switching unit is electrically connectedto the first scanning line, the source of the first switching unit iselectrically connected to the data line, the drain of the firstswitching unit is electrically connected to the pixel electrode; thegate of the second switching unit is electrically connected to thesecond scanning line, the source of the second switching unit iselectrically connected to the common electrode line, the drain of thesecond switching unit is electrically connected to the pixel electrode.

Wherein, the period of the first scanning signal is t1 the secondscanning line transmits the second scanning signal in the ½ t1 of thefirst scanning signal.

Wherein, the pixel electrode comprises a first sub pixel electrode and asecond sub pixel electrode, the common electrode line comprises a firstcommon electrode line and a second common electrode line, the firstswitching unit comprises a first switch, a second switch and a thirdswitch, the second switching unit comprises a fourth switch and a fifthswitch, the first scanning line comprises a first sub scanning line anda second sub scanning line, the first scanning signal comprises a firstsub scanning signal and a second sub scanning signal; wherein, the firstsub scanning line is used to transmit the first sub scanning signalwhich turns on the first switch and the second switch, the data lineprovides the pixel electrode voltage to the first sub pixel electrodeand the second sub pixel electrode through the first switch and thesecond switch which have turned on, charging the first sub pixelelectrode and the second sub pixel electrode. After the charge, thesecond sub scanning line transmits the second sub scanning signal toturn on the third switch, the first sub pixel electrode and the secondsub pixel electrode discharge. After the discharge, the first sub pixelelectrode and the second sub pixel electrode are in the state of holdingpower, the second scanning line transmits the second scanning signal, inorder to turn on the fourth switch and the fifth switch, the firstcommon electrode line and the second common electrode line respectivelyprovide the common voltage to the first sub pixel electrode and thesecond sub pixel electrode through the fourth switch and the fifthswitch which have turned on, in order to rise the pixel electrodevoltage to the common voltage.

Wherein, the first sub switch is electrically connected with the firstsub scanning line, the data line and the first sub pixel electrode; thesecond switch is electrically connected with the first sub scanningline, the data line and the second sub pixel electrode; the third switchis electrically connected with the second sub scanning line, the commonelectrode line and the fifth switch; the fourth switch is electricallyconnected with the first sub pixel electrode, the second scanning lineand the first common electrode; the fifth switch is electricallyconnected with the second sub pixel electrode, the second scanning lineand the second common electrode.

Wherein, the gate of the first switch is electrically connected to thefirst sub scanning line, the source of the first switch is electricallyconnected to the data line, the drain of the first switch iselectrically connected to the first sub pixel electrode: the gate of thesecond switch is electrically connected to the first sub scanning line,the source of the second switch is electrically connected to the dataline, the drain of the second switch is electrically connected to thesecond sub pixel electrode; the gate of the third switch is electricallyconnected to the second sub scanning line, the source of the thirdswitch is electrically connected to the common electrode line, the drainof the third switch is electrically connected to the drain of the fifthswitch; the gate of the fourth switch is electrically connected to thesecond scanning line, the source of the fourth switch is electricallyconnected to the first common electrode line, the drain of the fourthswitch is electrically connected to the first sub pixel electrode; thegate of the fifth switch is electrically connected to the secondscanning line, the source of the fifth switch is electrically connectedto the second common electrode line, the drain of the fifth switch iselectrically connected to the second sub pixel electrode.

Wherein, the period of the first sub scanning signal is t11 the secondscanning line transmits the second scanning signal in the ½ t11 of thefirst sub scanning signal.

In order to solve the technical issue, another technical solutionadopted by the present invention is to provide a liquid crystal displaydevice, the liquid crystal display device comprises an oppositelydisposed array substrate and a color film substrate, wherein, the arraysubstrate comprises a pixel structure, the pixel structure comprises adata line, a first scanning line which is orthogonal to the data line, asecond scanning line which is in parallel with the first scanning line,a pixel electrode which is provided between the first scanning line andthe second scanning line and a common electrode line which is used forproviding common voltage, the pixel structure also comprises the firstswitching unit which is electrically connected with the first scanningline and the second scanning unit which is electrically connected withthe second scanning line; wherein, the first scanning line is used totransmit a scanning signal of the first switching unit, the data lineprovides a pixel electrode voltage to the pixel electrode through thefirst switching unit which has turned on, charging the pixel electrode.After the charge, when the pixel electrode is in the state of holdingpower, the second scanning line transmits the second scanning signal toturn on the second switching unit, the common electrode line providesthe common voltage to the pixel electrode through the second switchingunit which has turned on, in order to rise the pixel electrode voltageto the common voltage.

Wherein, the gate of the first switching unit is electrically connectedto the first scanning line, the source of the first switching unit iselectrically connected to the data line, the drain of the firstswitching unit is electrically connected to the pixel electrode; thegate of the second switching unit is electrically connected to thesecond scanning line, the source of the second switching unit iselectrically connected to the common electrode line, the drain of thesecond switching unit is electrically connected to the pixel electrode.

Wherein, the period of the first scanning signal is t1, the secondscanning line transmits the second scanning signal in the ½ t1 of thefirst scanning signal.

Wherein, the pixel electrode comprises a first sub pixel electrode and asecond sub pixel electrode, the common electrode line comprises a firstcommon electrode line and a second common electrode line, the firstswitching unit comprises a first switch, a second switch and a thirdswitch, the second switching unit comprises a fourth switch and a fifthswitch, the first scanning line comprises a first sub scanning line anda second sub scanning line, the first scanning signal comprises a firstsub scanning signal and a second sub scanning signal; wherein, the firstsub scanning line is used to transmit the first sub scanning signalwhich turns on the first switch and the second switch, the data lineprovides the pixel electrode voltage to the first sub pixel electrodeand the second sub pixel electrode through the first switch and thesecond switch which have turned on, charging the first sub pixelelectrode and the second sub pixel electrode. After the charge, thesecond sub scanning line transmits the second sub scanning signal toturn on the third switch, the first sub pixel electrode and the secondsub pixel electrode discharge. After the discharge, the first sub pixelelectrode and the second sub pixel electrode are in the state of holdingpower, the second scanning line transmits the second scanning signal, inorder to turn on the fourth switch and the fifth switch, the firstcommon electrode line and the second common electrode line respectivelyprovide the common voltage to the first sub pixel electrode and thesecond sub pixel electrode through the fourth switch and the fifthswitch which have turned on, in order to rise the pixel electrodevoltage to the common voltage.

Wherein, the first sub switch is electrically connected with the firstsub scanning line, the data line and the first sub pixel electrode; thesecond switch is electrically connected with the first sub scanningline, the data line and the second sub pixel electrode; the third switchis electrically connected with the second sub scanning line, the commonelectrode line and the fifth switch; the fourth switch is electricallyconnected with the first sub pixel electrode, the second scanning lineand the first common electrode; the fifth switch is electricallyconnected with the second sub pixel electrode, the second scanning lineand the second common electrode.

Wherein, the gate of the first switch is electrically connected to thefirst sub scanning line, the source of the first switch is electricallyconnected to the data line, the drain of the first switch iselectrically connected to the first sub pixel electrode; the gate of thesecond switch is electrically connected to the first sub scanning line,the source of the second switch is electrically connected to the dataline, the drain of the second switch is electrically connected to thesecond sub pixel electrode; the gate of the third switch is electricallyconnected to the second sub scanning line, the source of the thirdswitch is electrically connected to the common electrode line, the drainof the third switch is electrically connected to the drain of the fifthswitch; the gate of the fourth switch is electrically connected to thesecond scanning line, the source of the fourth switch is electricallyconnected to the first common electrode line, the drain of the fourthswitch is electrically connected to the first sub pixel electrode; thegate of the fifth switch is electrically connected to the secondscanning line, the source of the fifth switch is electrically connectedto the second common electrode line, the drain of the fifth switch iselectrically connected to the second sub pixel electrode.

Wherein, the period of the first sub scanning signal is t11, the secondscanning line transmits the second scanning signal in the ½ t11 of thefirst sub scanning signal.

In order to solve the technical issue, the other technical solutionadopted by the present invention is to provide a driving method of thepixel structure, the pixel structure comprises a data line, a firstscanning line which is orthogonal to the data line, a second scanningline which is in parallel with the first scanning line, a pixelelectrode which is provided between the first scanning line and thesecond scanning line and a common electrode line which is used forproviding common voltage, the pixel structure also comprises the firstswitching unit which is electrically connected with the first scanningline and the second scanning unit which is electrically connected withthe second scanning line, wherein, the driving method comprises thefollowing steps: the first scanning line is used to transmit a scanningsignal of the first switching unit; the data line provides a pixelelectrode voltage to the pixel electrode through the first switchingunit which has turned on, charging the pixel electrode; after thecharge, when the pixel electrode is in the state of holding power, thesecond scanning line transmits the second scanning signal to turn on thesecond switching unit; the common electrode line provides the commonvoltage to the pixel electrode through the second switching unit whichhas turned on, in order to rise the pixel electrode voltage to thecommon voltage.

Wherein, the period of the first scanning signal is t1, the secondscanning line transmits the second scanning signal in the ½ t1 of thefirst scanning signal.

The benefits in present invention are as follows. Differing from thesituation of the prior art, the present invention provides a pixelstructure, the pixel structure comprises a data line, a first scanningline, a second scanning line, a pixel electrode, a common electrodeline, a first switching unit and a second switching unit, wherein, thefirst scanning line is used to transmit a scanning signal of the firstswitching unit, the data line provides a pixel electrode voltage to thepixel electrode through the first switching unit which has turned on,charging the pixel electrode. After the charge, when the pixel electrodeis in the state of holding power, the second scanning line transmits thesecond scanning signal to turn on the second switching unit, the commonelectrode line provides the common voltage to the pixel electrodethrough the second switching unit which has turned on, in order to risethe pixel electrode voltage to the common voltage. Through the aboveways, the first scanning line in the present invention mainly operatesduring the charging time of the pixel electrode, after the charge, thesecond scanning line starts working when the pixel electrode is in thestate of holding power, in order to rise the pixel electrode voltage tothe common voltage, achieving that inserting the black image. Theoperations of the second scanning line and the first scanning line aremutually independent and non-interfering. The second scanning linedoesn't affect the refresh rate of the first scanning line, therefore,ensuring the charging time of the pixel electrode. Furthermore, it onlyneeds the first scanning line operating during the charging time of thepixel electrode, which makes the resolution been higher in the presentinvention. Therefore, on one hand the present invention can ensure thecharging time of the pixel electrode and the resolution of the liquidcrystal display device, on the other hand it can also achieve theinserting black image technique, further reducing the 3D cross talk.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of an embodiment of the pixelstructure in the present invention;

FIG. 2 is equivalent circuit diagram of the pixel structure shown inFIG. 1;

FIG. 3 is a driving waveform of the first scanning line and the secondscanning line shown in FIG. 1;

FIG. 4 is a schematic structural diagram of the other embodiment of thepixel structure in the present invention;

FIG. 5 is a equivalent circuit diagram of the pixel structure shown inFIG. 4;

FIG. 6 is a driving waveform of the first scanning line and the secondscanning line shown in FIG. 4;

FIG. 7 is a schematic structural diagram of an embodiment of the liquidcrystal display device in the present invention;

FIG. 8 is a flow chart of the driving method of the pixel structure inthe present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The detailed descriptions accompanying drawings and the embodiment ofthe present invention are as follows.

Referring to FIG. 1 and FIG. 2, FIG. 1 is a schematic structural diagramof an embodiment of the pixel structure in the present invention, FIG. 2is a equivalent circuit diagram of the pixel structure shown in FIG. 1.As shown in FIG. 1 and FIG. 2, the pixel structure 10 in the presentinvention comprises a data line 11, a first scanning line 12 which isorthogonal to the data line 11 a second scanning line 13 which is inparallel with the first scanning line 12, a pixel electrode 14 which isprovided between the first scanning line 12 and the second scanning line13 and a common electrode line 15 which is used for providing commonvoltage, the pixel structure 10 also comprises the first switching unit16 which is electrically connected with the first scanning line 12 andthe second scanning unit 17 which is electrically connected with thesecond scanning line 13.

In the present embodiment, the gate G1 of the first switching unit 16 iselectrically connected to the first scanning line 12, the source S1 ofthe first switching unit 16 is electrically connected to the data line11, and the drain D1 of the first switching unit 16 is electricallyconnected to the pixel electrode 14.

The gate G2 of the second switching unit 17 is electrically connected tothe second scanning line 13, the source S2 of the second switching unit17 is electrically connected to the common electrode line 15, and thedrain D2 of the second switching unit 17 is electrically connected tothe pixel electrode 14. Wherein, the common electrode 15 is constitutedby two perpendicular and intersecting branches 151 and 152, Disposing anopening 111 above the source S2 of the second switching unit 17,disposing the other opening 110 above the branch 152 of the commonelectrode line 15, a conductive layer 112 connects the source S2 of thesecond switching unit 17 to the branch 152 of the common electrode line15 through the openings 110 and 111. The material of the conductivelayer 112 is preferably the same as the pixel electrode 14.

In the present embodiment, there is a liquid crystal layer (not shown)disposed above the pixel electrode 14, the common electrode line 15 isdisposed below the pixel electrode 14. Therefore, a liquid crystalcapacitor CLC is formed between the pixel electrode 14 and the liquidcrystal layer, a storage capacitor CST (as shown in FIG. 2) is formedbetween the pixel electrode 14 and the common electrode line 15.

Notably, the pixel structure 10 shown in FIG. 1 represents one of pixelstructure in the equivalent circuit shown in FIG. 2. The protectiverange of the present invention is that as long as meeting the pixelstructure in the circuit shown in FIG. 2.

The following describes the working principle of the pixel structure 10:

Referring to FIG. 3, FIG. 3 is a driving waveform of the first scanningline 12 and the second scanning line 13 of the pixel structure 10. Thefirst scanning line 12 is used to transmit a scanning signal Gate1 ofturning on the first switching unit 16, the data line 11 provides apixel electrode voltage to the pixel electrode 14 through the firstswitching unit 16 which has turned on, charging the pixel electrode 14.After the charge, when the pixel electrode 14 is in the state of holdingpower, the second scanning line 13 transmits the second scanning signalGate2 to turn on the second switching unit 17, the common electrode line15 provides the common voltage to the pixel electrode 14 through thesecond switching unit 17 which has turned on, in order to rise the pixelelectrode voltage to the common voltage, achieving that inserting theblack image.

In the present embodiment, the period t1 of the first scanning signalGate1 is the same as the period t2 of the second scanning signal Gate2,the second scanning line 13 transmits the second scanning signal in the½ t1 of the first scanning signal Gate2.

As the above description, because the pixel structure 10 comprises thefirst scanning line 12 and the second scanning line 13, the firstscanning line 12 mainly operates during the charging time of the pixelelectrode 14, the second scanning line 13 mainly transmits the secondscanning signal Gate2 when the pixel electrode 14 is in the state ofholding power after the charge, rising the pixel electrode voltage tothe common voltage, achieving that inserting the black image. Theoperations of the second scanning line 13 and the first scanning line 12are mutually independent and non-interfering. The second scanning line13 doesn't affect the refresh rate of the first scanning line 12,therefore, ensuring the charging time of the pixel electrode.

Furthermore, it only needs the first scanning line 12 operating duringthe charging time of the pixel electrode 14, which makes the resolutionbeen higher in the present embodiment.

Therefore, on one hand the pixel structure 10 of the present inventioncan ensure the charging time of the pixel electrode 14 and theresolution of the liquid crystal display device, on the other hand itcan also achieve the inserting black image technique, further reducingthe 3D cross talk.

The present invention also provides the other pixel structure, which isdescribed in detail on the basis of the above pixel structure. Referringto FIG. 4 and FIG. 5, the pixel structure 40 comprises a data line 41, afirst scanning line 42 which is orthogonal to the data line, a secondscanning line 43 which is in parallel with the first scanning line 42, apixel electrode 44 which is provided between the first scanning line 42and the second scanning line 43 and a common electrode line 45 which isused for providing common voltage, the pixel structure 40 also comprisesthe first switching unit 42 which is electrically connected with thefirst scanning line 46 and the second scanning unit 47 which iselectrically connected with the second scanning line 43. wherein, thestructures of the data line 41, the first scanning line 42, the secondscanning line 43, the pixel electrode 44, the common electrode line 45,the first switching unit 46 and the second switching unit 47 arerespectively the same as the data line 11, the first scanning line 12,the second scanning line 13, the pixel electrode 14, the commonelectrode line 15, the first switching unit 16 and the second switchingunit 17 shown in FIG. 1.

The pixel structure 40 of the present embodiment is a wide angle pixelstructure. Specifically, the pixel electrode 44 in the presentembodiment comprises a first sub pixel electrode 441 and a second subpixel electrode 442, the common electrode line 45 comprises a firstcommon electrode line 451 and a second common electrode line 452, thefirst switching unit 46 comprises a first switch 461, a second switch462 and a third switch 463, the second switching unit 47 comprises afourth switch 471 and a fifth switch 472, the first scanning line 42comprises a first sub scanning line 421 and a second sub scanning line422, the first scanning signal Gate1 comprises a first sub scanningsignal Gate11 and a second sub scanning signal Gate12. Wherein, thefirst sub switch 461 is electrically connected with the first subscanning line 421, the data line 41 and the first sub pixel electrode441. The second switch 462 is electrically connected with the first subscanning line 421, the data line 41 and the second sub pixel electrode442. The third switch 463 is electrically connected with the second subscanning line 422, the common electrode line 45 and the fifth switch472. The fourth switch 471 is electrically connected with the first subpixel electrode 441, the second scanning line 43 and the first commonelectrode 451. The fifth switch 472 is electrically connected with thesecond sub pixel electrode 442, the second scanning line 43 and thesecond common electrode 452.

Specifically, the gate G11 of the first switch 461 is electricallyconnected to the first sub scanning line 421, the source S11 of thefirst switch 461 is electrically connected to the data line 41, thedrain D11 of the first switch 461 is electrically connected to the firstsub pixel electrode 441,

The gate G12 of the second switch 462 is electrically connected to thefirst sub scanning line 421, the source S12 of the second switch 462 iselectrically connected to the data line 41, the drain D12 of the secondswitch 462 is electrically connected to the second sub pixel electrode442.

The gate G13 of the third switch 363 is electrically connected to thesecond sub scanning line 422, the source S13 of the third switch 463 iselectrically connected to the common electrode line 45, the drain D13 ofthe third switch 463 is electrically connected to the drain D15 of thefifth switch 472. Wherein, the first common electrode line 451 isconstituted by two perpendicular and intersecting branches 4511 and4512, the second common electrode line 352 is constituted by twoperpendicular and intersecting branches 4521 and 4522. There is asharing capacitor C10 (as shown in FIG. 5) formed between the source S13of the third switch 463 and branch 4522.

The gate G14 of the fourth switch 471 is electrically connected to thesecond scanning line 43, the source S14 of the fourth switch 471 iselectrically connected to the first common electrode line 451, the drain014 of the fourth switch 471 is electrically connected to the first subpixel electrode 441. Wherein, disposing an opening 140 above the source814 of the fourth switch 471, disposing the other opening 141 above thebranch 4512 of the first common electrode line 451, a conductive layer142 connects the source 514 of the fourth switch 471 to the branch 4512of the first common electrode line 451 through the openings 140 and 141.The material of the conductive layer 142 is preferably the same as thepixel electrode 44.

The gate G15 of the fifth switch 472 is electrically connected to thesecond scanning line 43, the source S15 of the fifth switch 472 iselectrically connected to the second common electrode line 452, thedrain 015 of the fifth switch 472 is electrically connected to thesecond sub pixel electrode 442. Wherein, disposing an opening 150 abovethe source S15 of the fifth switch 472, disposing the other opening 151above the branch 4522 of the second common electrode line 452, aconductive layer 152 connects the source S15 of the fifth switch 472 tothe branch 4522 of the second common electrode line 452 through theopenings 150 and 151. The material of the conductive layer 152 ispreferably the same as the pixel electrode 44.

In the present embodiment, there is a liquid crystal layer (not shown)disposed' above the first sub pixel electrode 441, the first commonelectrode line 451 is disposed below the first sub pixel electrode 441.Therefore, a first liquid crystal capacitor CLC1 is formed between thefirst sub pixel electrode 441 and the liquid crystal layer, a firststorage capacitor CST1 (as shown in FIG. 5) is formed between the firstsub pixel electrode 441 and the first common electrode line 451.Similarly, there is a liquid crystal layer (not shown) disposed abovethe second sub pixel electrode 442, the second common electrode 452 isdisposed below the second sub pixel electrode 442, Therefore, the secondliquid crystal capacitor CLC2 is formed between the second sub pixelelectrode 442 and the liquid crystal layer, the second storage capacitorCST2 (as shown in FIG. 5) is formed between the second sub pixelelectrode 442 and the second common electrode 452.

Notably, the pixel structure 40 shown in FIG. 4 represents one of pixelstructure in the equivalent circuit shown in FIG. 5. The protectiverange of the present invention is that as long as meeting the pixelstructure in the circuit shown in FIG. 5.

The following describes the working principle of the pixel structure 40:

Referring to FIG. 6, FIG. 6 is a driving waveform of the first subscanning line 421, the second sub scanning line 422 and the secondscanning line 43. The first sub scanning line 421 is used to transmit afirst sub scanning signal Gate11 of turning on the first switch 461 andthe second switch 462, the data line 41 provides a pixel electrodevoltage to the first sub pixel electrode 441 and the second sub pixelelectrode 442 through the first switch 461 and the second switch 462which have turned on, charging the first sub pixel electrode 441 and thesecond sub pixel electrode 442. After the charge, the second subscanning line 422 transmits the second sub scanning signal Gate12 toturn on the third switch 463, the first sub pixel electrode 441 and thesecond sub pixel electrode 442 discharge, after the discharge, when thefirst sub pixel electrode 441 and the second sub pixel electrode 442 arein the state of holding power, the second scanning line 43 transmits thesecond scanning signal Gate2 to turn on the fourth switch 471 and thefifth switch 472, the first common electrode line 451 and the secondcommon electrode line 452 respectively provides the common voltage tothe first sub pixel electrode 441 and the second sub pixel electrode 442through the fourth switch 471 and the fifth switch 472 which have turnedon, in order to rise the pixel electrode voltage to the common voltage,achieving that inserting the black image.

In the present embodiment, the period t11, t12 and t2 of the first subscanning signal Gate11, the second sub scanning signal Gate12 and thesecond scanning signal Gate2 are the same. The second scanning line 43preferably transmits the second scanning signal Gate2 in the ½ t11 ofthe first sub scanning signal Gate11.

Similarly, on one hand the pixel structure 40 in the present embodimentcan ensure the charging time of the pixel electrode 44 and theresolution of the liquid crystal display device, on the other handachieving the inserting black image technique, further reducing the 3Dcross talk

Referring to FIG. 7, FIG. 7 is a schematic structural diagram of anembodiment of the liquid crystal display device in the presentinvention. As shown in FIG. 7, the liquid crystal display device 70 inthe present invention comprises an oppositely disposed array substrate71 a color film substrate 72 and a liquid crystal layer 73 which isdisposed between the array substrate 71 and the color film substrate 72,wherein, the array substrate 71 comprises the pixel structure describedabove.

Referring to FIG. 8, FIG. 8 is a flow chart of the driving method of thepixel structure in the present invention. Wherein, the pixel structurein the present embodiment is the one described above, specifically, thepixel structure in the present embodiment comprises a data line, a firstscanning line which is orthogonal to the data line, a second scanningline which is in parallel with the first scanning line, a pixelelectrode which is provided between the first scanning line and thesecond scanning line and a common electrode line which is used forproviding common voltage, the pixel structure also comprises the firstswitching unit which is electrically connected with the first scanningline and the second scanning unit which is electrically connected withthe second scanning line. As shown in FIG. 8, the driving method of thepixel structure in the present embodiment comprises the following steps:

Step S1: the first scanning line is used to transmit a scanning signalof the first switching unit.

Step S2: the data line provides a pixel electrode voltage to the pixelelectrode through the first switching unit which has turned on, chargingthe pixel electrode.

Step S3: after the charge, when the pixel electrode is in the state ofholding power, the second scanning line transmits the second scanningsignal to turn on the second switching unit.

In the step S3, the period t1 and t2 of the first scanning signal andthe second scanning signal are the same. And the second scanning linepreferably transmits the second scanning signal in the ½ t1 of the firstscanning signal.

Step S4: the common electrode line provides the common voltage to thepixel electrode through the second switching unit which has turned on,in order to rise the pixel electrode voltage to the common voltage.

In summary, the pixel structure in the present invention turns on thefirst switching unit through that the first scanning line transmits thefirst signal, it makes the data line provide a pixel electrode voltageto the pixel electrode through the first switching unit which has turnedon, charging the pixel electrode. After the charge, when the pixelelectrode is in the state of holding power, the second scanning linetransmits the second scanning signal to turn on the second switchingunit, the common electrode line provides the common voltage to the pixelelectrode through the second switching unit which has turned on, inorder to rise the pixel electrode voltage to the common voltage,achieving that inserting the black image. Through above ways, on onehand the present invention can ensure the charging time of the pixelelectrode and the resolution of the liquid crystal display device, onthe other hand inserting the black image, achieving the inserting blackimage technique, reducing the 3D cross talk.

The preferred embodiments according to the present invention arementioned above, which cannot be used to define the scope of the rightof the present invention. Those variations of equivalent structure orequivalent process according to the present specification and thedrawings or directly or indirectly applied in other areas of technologyare considered encompassed in the scope of protection defined by theclams of the present invention.

What is claimed is:
 1. A pixel structure, wherein, the pixel structurecomprises a data line, a first scanning line which is orthogonal to thedata line, a second scanning line which is in parallel with the firstscanning line, a pixel electrode which is provided between the firstscanning line and the second scanning line and a common electrode linewhich is used for providing common voltage, the pixel structure alsocomprises the first switching unit which is electrically connected withthe first scanning line and the second scanning unit which iselectrically connected with the second scanning line; wherein, the firstscanning line is used to transmit a scanning signal of the firstswitching unit, the data line provides a pixel electrode voltage to thepixel electrode through the first switching unit which has turned on,charging the pixel electrode, after the charge, when the pixel electrodeis in the state of holding power, the second scanning line transmits thesecond scanning signal to turn on the second switching unit, the commonelectrode line provides the common voltage to the pixel electrodethrough the second switching unit which has turned on, in order to risethe pixel electrode voltage to the common voltage.
 2. The pixelstructure as claimed in claim 1, wherein, the gate of the firstswitching unit is electrically connected to the first scanning line, thesource of the first switching unit is electrically connected to the dataline, the drain of the first switching unit is electrically connected tothe pixel electrode, the gate of the second switching unit iselectrically connected to the second scanning line, the source of thesecond switching unit is electrically connected to the common electrodeline, the drain of the second switching unit is electrically connectedto the pixel electrode.
 3. The pixel structure as claimed in claim 1,wherein, the period of the first scanning signal is t1, the secondscanning line transmits the second scanning signal in the ½ t1 of thefirst scanning signal.
 4. The pixel structure as claimed in claim 1,wherein, the pixel electrode comprises a first sub pixel electrode and asecond sub pixel electrode, the common electrode line comprises a firstcommon electrode line and a second common electrode line, the firstswitching unit comprises a first switch, a second switch and a thirdswitch, the second switching unit comprises a fourth switch and a fifthswitch, the first scanning line comprises a first sub scanning line anda second sub scanning line, the first scanning signal comprises a firstsub scanning signal and a second sub scanning signal; wherein, the firstsub scanning line is used to transmit the first sub scanning signalwhich turns on the first switch and the second switch, the data lineprovides the pixel electrode voltage to the first sub pixel electrodeand the second sub pixel electrode through the first switch and thesecond switch which have turned on, charging the first sub pixelelectrode and the second sub pixel electrode, after the charge, thesecond sub scanning line transmits the second sub scanning signal toturn on the third switch, the first sub pixel electrode and the secondsub pixel electrode discharge, after the discharge, the first sub pixelelectrode and the second sub pixel electrode are in the state of holdingpower, the second scanning line transmits the second scanning signal, inorder to turn on the fourth switch and the fifth switch, the firstcommon electrode line and the second common electrode line respectivelyprovide the common voltage to the first sub pixel electrode and thesecond sub pixel electrode through the fourth switch and the fifthswitch which have turned on, in order to rise the pixel electrodevoltage to the common voltage.
 5. The pixel structure as claimed inclaim 4, wherein, the first sub switch is electrically connected withthe first sub scanning line, the data line and the first sub pixelelectrode; the second switch is electrically connected with the firstsub scanning line, the data line and the second sub pixel electrode; thethird switch is electrically connected with the second sub scanningline, the common electrode line and the fifth switch; the fourth switchis electrically connected with the first sub pixel electrode, the secondscanning line and the first common electrode; the fifth switch iselectrically connected with the second sub pixel electrode, the secondscanning line and the second common electrode.
 6. The pixel structure asclaimed in claim 5, wherein, the gate of the first switch iselectrically connected to the first sub scanning line, the source of thefirst switch is electrically connected to the data line, the drain ofthe first switch is electrically connected to the first sub pixelelectrode; the gate of the second switch is electrically connected tothe first sub scanning line, the source of the second switch iselectrically connected to the data line, the drain of the second switchis electrically connected to the second sub pixel electrode; the gate ofthe third switch is electrically connected to the second sub scanningline, the source of the third switch is electrically connected to thecommon electrode line, the drain of the third switch is electricallyconnected to the drain of the fifth switch; the gate of the fourthswitch is electrically connected to the second scanning line, the sourceof the fourth switch is electrically connected to the first commonelectrode line, the drain of the fourth switch is electrically connectedto the first sub pixel electrode; the gate of the fifth switch iselectrically connected to the second scanning line, the source of thefifth switch is electrically connected to the second common electrodeline, the drain of the fifth switch is electrically connected to thesecond sub pixel electrode.
 7. The pixel structure as claimed in claim4, wherein, the period of the first sub scanning signal is t11, thesecond scanning line transmits the second scanning signal in the ½ t11of the first sub scanning signal.
 8. A liquid crystal display device,wherein, the liquid crystal display device comprises an oppositelydisposed array substrate and a color film substrate, wherein, the arraysubstrate comprises a pixel structure, the pixel structure comprises adata line, a first scanning line which is orthogonal to the data line, asecond scanning line which is in parallel with the first scanning line,a pixel electrode which is provided between the first scanning line andthe second scanning line and a common electrode line which is used forproviding common voltage, the pixel structure also comprises the firstswitching unit which is electrically connected with the first scanningline and the second scanning unit which is electrically connected withthe second scanning line; wherein, the first scanning line is used totransmit a scanning signal of the first switching unit, the data lineprovides a pixel electrode voltage to the pixel electrode through thefirst switching unit which has turned on, charging the pixel electrode,after the charge, when the pixel electrode is in the state of holdingpower, the second scanning line transmits the second scanning signal toturn on the second switching unit, the common electrode line providesthe common voltage to the pixel electrode through the second switchingunit which has turned on, in order to rise the pixel electrode voltageto the common voltage.
 9. The liquid crystal display device as claimedin claim 8, wherein, the gate of the first switching unit iselectrically connected to the first scanning line, the source of thefirst switching unit is electrically connected to the data line, thedrain of the first switching unit is electrically connected to the pixelelectrode; the gate of the second switching unit is electricallyconnected to the second scanning line, the source of the secondswitching unit is electrically connected to the common electrode line,the drain of the second switching unit is electrically connected to thepixel electrode.
 10. The liquid crystal display device as claimed inclaim 8, wherein, the period of the first scanning signal is t1, thesecond scanning line transmits the second scanning signal in the ½ t1 ofthe first scanning signal.
 11. The liquid crystal display device asclaimed in claim 8, wherein, the pixel electrode comprises a first subpixel electrode and a second sub pixel electrode, the common electrodeline comprises a first common electrode line and a second commonelectrode line, the first switching unit comprises a first switch, asecond switch and a third switch, the second switching unit comprises afourth switch and a fifth switch, the first scanning line comprises afirst sub scanning line and a second sub scanning line, the firstscanning signal comprises a first sub scanning signal and a second subscanning signal; wherein, the first sub scanning line is used totransmit the first sub scanning signal which turns on the first switchand the second switch, the data line provides the pixel electrodevoltage to the first sub pixel electrode and the second sub pixelelectrode through the first switch and the second switch which haveturned on, charging the first sub pixel electrode and the second subpixel electrode, after the charge, the second sub scanning linetransmits the second sub scanning signal to turn on the third switch,the first sub pixel electrode and the second sub pixel electrodedischarge, after the discharge, the first sub pixel electrode and thesecond sub pixel electrode are in the state of holding power, the secondscanning line transmits the second scanning signal, in order to turn onthe fourth switch and the fifth switch, the first common electrode lineand the second common electrode line respectively provide the commonvoltage to the first sub pixel electrode and the second sub pixelelectrode through the fourth switch and the fifth switch which haveturned on, in order to rise the pixel electrode voltage to the commonvoltage.
 12. The liquid crystal display device as claimed in claim 11,wherein, the first sub switch is electrically connected with the firstsub scanning line, the data line and the first sub pixel electrode; thesecond switch is electrically connected with the first sub scanningline, the data line and the second sub pixel electrode; the third switchis electrically connected with the second sub scanning line, the commonelectrode line and the fifth switch; the fourth switch is electricallyconnected with the first sub pixel electrode, the second scanning lineand the first common electrode; the fifth switch is electricallyconnected with the second sub pixel electrode, the second scanning lineand the second common electrode.
 13. The liquid crystal display deviceas claimed in claim 12, wherein, the gate of the first switch iselectrically connected to the first sub scanning line, the source of thefirst switch is electrically connected to the data line, the drain ofthe first switch is electrically connected to the first sub pixelelectrode; the gate of the second switch is electrically connected tothe first sub scanning line, the source of the second switch iselectrically connected to the data line, the drain of the second switchis electrically connected to the second sub pixel electrode; the gate ofthe third switch is electrically connected to the second sub scanningline, the source of the third switch is electrically connected to thecommon electrode line, the drain of the third switch is electricallyconnected to the drain of the fifth switch; the gate of the fourthswitch is electrically connected to the second scanning line, the sourceof the fourth switch is electrically connected to the first commonelectrode line, the drain of the fourth switch is electrically connectedto the first sub pixel electrode; the gate of the fifth switch iselectrically connected to the second scanning line, the source of thefifth switch is electrically connected to the second common electrodeline, the drain of the fifth switch is electrically connected to thesecond sub pixel electrode.
 14. The liquid crystal display device asclaimed in claim 11, wherein, the period of the first sub scanningsignal is t11, the second scanning line transmits the second scanningsignal in the ½ t11 of the first sub scanning signal.
 15. A drivingmethod of the pixel structure, the pixel structure comprises a dataline, a first scanning line which is orthogonal to the data line, asecond scanning line which is in parallel with the first scanning line,a pixel electrode which is provided between the first scanning line andthe second scanning line and a common electrode line which is used forproviding common voltage, the pixel structure also comprises the firstswitching unit which is electrically connected with the first scanningline and the second scanning unit which is electrically connected withthe second scanning line, wherein, the driving method comprises thefollowing steps: the first scanning line is used to transmit a scanningsignal of the first switching unit; the data line provides a pixelelectrode voltage to the pixel electrode through the first switchingunit which has turned on, charging the pixel electrode; after thecharge, when the pixel electrode is in the state of holding power, thesecond scanning line transmits the second scanning signal to turn on thesecond switching unit; the common electrode line provides the commonvoltage to the pixel electrode through the second switching unit whichhas turned on, in order to rise the pixel electrode voltage to thecommon voltage.
 16. The method as claimed in claim 15, wherein, theperiod of the first scanning signal is t1, the second scanning linetransmits the second scanning signal in the ½ t1 of the first scanningsignal.